Managing main zones
                                        Main zones group multiple zones and allow aggregated evaluations. Each zone can only be part of one main zone. A main zone can, for example, illustrate a county which comprises several towns (Fundamentals: Main zones and main OD pairs).
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                                                         Note: You can aggregate zones according to their allocation to main zones and thus generate an assignment-enabled model for main zones (Aggregating zones based on main zones).  | 
                                                

